Improving charge-injection balance and cathode transmittance of top-emitting organic light-emitting device with p-type silicon anode

Both charge-injection balance and high transmittance for the cathode are important to achieve high electroluminescence (EL) efficiency for a top-emitting organic light-emitting device (TEOLED) fabricated on silicon substrate. In this letter, by optimizing the electrical resistivity of the p-type silicon chip used as the anode and applying a Yb∕Au double layer cathode with high electron-injection property and high transmittance, the TEOLED with a configuration of p-type silicon∕thermal grown SiO2∕NPB∕Alq3∕Yb∕Au exhibits a higher EL efficiency than those of the TEOLEDs each with a Si chip as the anode reported previously. Its current efficiency is almost equal to that of a TEOLED with the same configuration except for an indium tin oxide anode.